5
Wood Chemistry PSE 406 Lecture 125 Protection Chemicals l Here is a list of the classes of extractives that can serve to protect the tree. We will look at most of these. »Terpenes »Resin Acids »Flavonoids »Lignans »Stilbenes »Tannins »Phenolics and others

6
Wood Chemistry PSE 406 Lecture 126 “Other Extractives” l These extractives are in the tree typically for reasons other than protection. »Fats and fatty acids »Proteins »Flavonoids (I know they are involved in protection). »Sterols

7
Wood Chemistry PSE 406 Lecture 127 The Fragrance of a Tree l Each tree has a unique fragrance. »Some have strong fragrances. than others like Cedar. »Some have only light odor l The aroma is due to volatile compounds produced by the tree. (the odor chemicals become gases easily) l These chemicals can be isolated and sold.

8
Wood Chemistry PSE 406 Lecture 128 Softwood Fragrance Chemicals l The fragrance of softwood trees are typically from a class of chemicals named terpenes. l Terpenes are hydrocarbon derivatives of isoprene; a chemical that can be produced from petroleum.

21
Wood Chemistry PSE 406 Lecture 1221 Role of Sesquiterpenes l Used to control other plants in a deleterious fashion. (Allelopathy) l Anti bacterial compounds (Phytoalexins) l Used by fungi to break down plants (Phytotoxins) l Defensive chemicals used by plants against insects and fungi